Facile Synthesis of Fe‐Doped CoO Nanotubes as High‐Efficient Electrocatalysts for Oxygen Evolution Reaction

Abstract

Developing high‐performance, low‐cost, and robust electrocatalysts is of great importance to boost the efficiency of oxygen evolution reaction (OER). Herein, based on the integrated design of chemical composition and geometric structure, Fe‐doped CoO nanotubes (NTs) with high OER activity are prepared by a facile template‐free approach. The construction of this tubular structure is realized via a simple wet‐chemical reaction to prepare solid nanorods as precursor and a subsequent calcination treatment of the precursor to form hollow cavity. The favorable composition and unique hollow structure endow these Fe‐doped CoO NTs with remarkable activity toward OER. When used as the electrocatalyst for OER, the Fe‐doped CoO NTs show a small overpotential of 282 mV at the current density of 10 mA cm−2, a low Tafel slope of 78.26 mV dec−1, and a high turnover frequency of 0.0965 s−1 at the overpotential of 282 mV, which is superior to those of CoO NTs and solid CoO nanoparticles. Moreover, the Fe‐doped CoO NTs also exhibit excellent long‐term stability of 24 h at the current density of 10 mA cm−2.

Oriented growth of stacking α-cobalt hydroxide salt continuous films and their topotactic-like transformation to oriented mesoporous films of Co3O4 and CoO

“…8,[12][13][14] This TPT feature allows the template-free facile formation of crystallographically oriented nanoporous oxides. Cobalt oxides (Co x O y ), including cobalt(II, III) oxide (Co 3 O 4 ) and cobalt(II) oxide (CoO), are among the most studied oxides prepared from LHS precursors because of their application in anode materials for lithium ion batteries, 15,16 electrochemical capacitors 17,18 and (photo)electrocatalysts for water splitting reactions (both hydrogen and oxygen evolution reactions) [19][20][21][22] and for CO 2 reduction. 23,24 Several types of cobalt-based LHSs (Co-LHSs), e.g., Co(OH) 2 , Co 2 (NO 3 )(OH) 3 and Co 7 (NO 3 ) 2 (OH) 12 , have been synthesized by means of alkaline precipitation and hydrothermal methods.…”

“…Cobalt oxides (Co x O y ), including cobalt( ii , iii ) oxide (Co 3 O 4 ) and cobalt( ii ) oxide (CoO), are among the most studied oxides prepared from LHS precursors because of their application in anode materials for lithium ion batteries, 15,16 electrochemical capacitors 17,18 and (photo)electrocatalysts for water splitting reactions (both hydrogen and oxygen evolution reactions) 19–22 and for CO 2 reduction. 23,24 Several types of cobalt-based LHSs (Co-LHSs), e.g.…”

Improving the Oxygen Evolution Activity of Layered Double‐Hydroxide via Erbium‐Induced Electronic Engineering

“…[1][2] Oxygen evolution reaction (OER) is a key anodic reaction of water splitting, which often constrains hydrogen production efficiency due to the sluggish kinetics of multistep electron transfer. [3][4][5][6] To lower the energy cost of electronic structure via introducing additional transition-metal species has become a more extensive modification method for LDH. [36,37] One notable example is by Sun et al, who confirmed the well-performed OER activity of W-doped FeNi-LDH, [38] and found that W doping into FeNi-LDH offered the favorable surface electronic structure and charge transfer because of the localized W 5d states, and thus optimize the intermediates adsorption energy by decreasing the G O -G HO .…”

Hybrid high-performance aqueous batteries with potassium-based cathode||zinc metal anode

“…The limitations of renewable energies, such as the unpredictable availability and non-uniformity in distribution, urge the development of large-scale energy storage systems [1][2][3][4][5][6][7][8][9][10][11][12]. Among many energy storage technologies, a rechargeable battery based on the conversion between electric and chemical energy is one of the most effective methods due to its unparalleled conversion efficiency.…”